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US 8,299,304 B2Granted
Alignment material for liquid crystal display device of vertical alignment mode and method of preparing the same
AssigneeDongjin Semichem Co., Ltd.
InventorsJin wook Choi, Dal bong Seo, Jae cheol Park, Yong bae Kim
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Abstract
This invention provides alignment materials for liquid crystal display device of vertical alignment mode and methods for the preparation of the same, and more particularly, it provides diaminobenzene derivatives represented by the following formula 1 (shown in description), capable of aligning liquid crystal in uniform and vertical way and remarkably improving clarity and solubility against organic solvents, methods for the preparation of the same and liquid crystal alignment films using the same.
Claims1
A method for the preparation of the diamine compound represented by formula 1:
- wherein R1 is an alkyl group having 5 to 7 carbon atoms or alkoxy group having 5 to 7 carbon atoms,
- comprising:
- a) preparing a compound of formula 2 by reacting 4′-alkylbicyclohexyl-4-one compound with 1,3,5-tribromobenzene:
- wherein R1 is an alkyl group having 5 to 7 carbon atoms or alkoxy group having 5 to 7 carbon atoms;
- b) preparing a compound of formula 3 by reacting the compound of formula 2 with p-toluenesulfonic acid 1-hydrate:
- wherein R1 is an alkyl group having 5 to 7 carbon atoms or alkoxy group having 5 to 7 carbon atoms;
- c) preparing a compound of formula 4 by reacting the compound of formula 3 with lithium bis(trimethylsilyl)amide, (dibenzylideneacetone)palladium, and tricyclohexylphosphine in combination:
- wherein R1 is an alkyl group having 5 to 7 carbon atoms or alkoxy group having 5 to 7 carbon atoms;
- and
- d) performing the addition of hydrogen to the compound of formula 4 under a Pd/C catalyst and separating a trans isomer compound therefrom.
7 more elements
Dependencies are inferred from the claim text.